Hopes of a breakthrough in negotiations between Iran and the US faded further on Sunday, amid a deepening sense of a deadlock in the nearly two-month-long conflict despite intense regional diplomatic activity. Washington and Tehran appear unwilling to moderate rhetoric or make concessions, and there are no negotiations scheduled that might bring the war to a definitive end. On Sunday, Abbas Araghchi, Iran’s foreign minister, returned to Pakistan for a second consecutive days of talks with mediators after a brief trip to Oman for discussions there. Araghchi described his Pakistan trip on Saturday as “very fruitful” but signalled scepticism over Washington’s intentions. “Have yet to see if the US is truly serious about diplomacy,” he said on X . On Saturday, Donald Trump announced that he had cancelled a visit to Pakistan by his envoys, Steve Witkoff and Jared Kushner. The two men were to take part in a second round of talks with Iran which had been tentatively scheduled for this weekend.…